text: In chemistry, an electrofuge is a leaving group which does not retain the lone pair of electrons from its previous bond with another species (in contrast to a nucleofuge, which does). It can result from the heterolytic breaking of covalent bonds.
  After this reaction an electrofuge may possess either a positive or a neutral charge; this is governed by the nature of the specific reaction.
  An example would be the loss of  from a molecule of benzene during nitration.
  The word electrofuge is commonly found in older literature, but its use in contemporary organic chemistry is now uncommon.